GMC SIERRA 2002 Manual page 321

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Heavy Duty Trailer Wiring Package (If Equipped)
Your pickup may be equipped with the eight
towing harness. This harness with a seven
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heavy duty trailer connector is attached to a bracket on
the platform hitch.*
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* The Center High Mounted Stoplamp (CHMSL) wire
is tied next to the trailer wiring harness for use with a
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trailer, slide in camper or cap.
4-92
The eight
trailer circuits:
D
Yellow: Left Stop/Turn Signal
D
Dark Green: Right Stop/Turn Signal
D
Brown: Taillamps
D
White: Ground
D
Light Green: Back
D
Light Blue: CHMSL
D
Red: Battery Feed
D
Dark Blue: Trailer Brake
A jumper harness for an electric trailer brake controller
and a trailer battery feed fuse are included with this
trailering package. (See "Instrument Panel Jumper
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wire trailer
Wiring Harness" later in this section.)
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pin universal
If you need to tow a light
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four way round pin connector, an adapter connector is
included with your vehicle.
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wire harness contains the following
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up Lamps
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duty trailer with a standard